This function is similar to krb5_unparse_name() , but allows the use of an existing buffer for the result. If size is not NULL, then name must point to either NULL or an existing buffer of at least the size pointed to by size . The buffer will be allocated or resized if necessary, with the new pointer stored into name . Whether or not the buffer is resized, the necessary space for the result, including null terminator, will be stored into size .